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Aleksandr Nogikh ecc04463d1 kcov: don't generate a warning on vm_insert_page()'s failure 
vm_insert_page()'s failure is not an unexpected condition, so don't do
WARN_ONCE() in such a case.

Instead, print a kernel message and just return an error code.

This flaw has been reported under an OOM condition by sysbot [1].

The message is mainly for the benefit of the test log, in this case the
fuzzer's log so that humans inspecting the log can figure out what was
going on.  KCOV is a testing tool, so I think being a little more chatty
when KCOV unexpectedly is about to fail will save someone debugging
time.

We don't want the WARN, because it's not a kernel bug that syzbot should
report, and failure can happen if the fuzzer tries hard enough (as
above).

Link: https://lkml.kernel.org/r/Ylkr2xrVbhQYwNLf@elver.google.com [1]
Link: https://lkml.kernel.org/r/20220401182512.249282-1-nogikh@google.com
Fixes: b3d7fe86fb ("kcov: properly handle subsequent mmap calls"),
Signed-off-by: Aleksandr Nogikh <nogikh@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Taras Madan <tarasmadan@google.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-04-21 20:01:10 -07:00
arch Xtensa fixes for v5.18: 2022-04-20 12:43:27 -07:00
block block: don't print I/O error warning for dead disks 2022-04-15 06:33:03 -06:00
certs
crypto
Documentation Changes since last update: 2022-04-20 12:35:20 -07:00
drivers spi: Fixes for v5.18 2022-04-19 10:30:43 -07:00
fs mm, hugetlb: allow for "high" userspace addresses 2022-04-21 20:01:09 -07:00
include oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup 2022-04-21 20:01:10 -07:00
init
ipc
kernel kcov: don't generate a warning on vm_insert_page()'s failure 2022-04-21 20:01:10 -07:00
lib Driver core changes for 5.18-rc2 2022-04-10 09:55:09 -10:00
LICENSES
mm oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup 2022-04-21 20:01:10 -07:00
net Networking fixes for 5.18-rc3, including fixes from wireless and 2022-04-14 11:58:19 -07:00
samples
scripts hardening fixes for v5.18-rc3 2022-04-12 14:29:40 -10:00
security
sound sound fixes for 5.18-rc3 2022-04-14 11:08:12 -07:00
tools selftest/vm: add skip support to mremap_test 2022-04-21 20:01:10 -07:00
usr
virt KVM/arm64 fixes for 5.18, take #1 2022-04-08 12:30:04 -04:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap mailmap: update Vasily Averin's email address 2022-04-08 14:20:36 -10:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: add Vincenzo Frascino to KASAN reviewers 2022-04-21 20:01:10 -07:00
Makefile Linux 5.18-rc3 2022-04-17 13:57:31 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.